Remaining capacity of memory card is shown wrong on system ?

[Android Central Question]

Memory status showed by system file explorer and Es explorer is 12.97 GB used ,but when I scan space with Es explorer to delete files it shows 8.85 GB used. If I unmount memory card and then mount it again it shows 8.85 GB used in both file explorers but after while if I download something and delete ,it shows 12.97 GB used space .